关于spring:通过Spring-Boot构建一个购物车微服务

在Spring MVC中，您能够创立REST应用程序。

您创立一个应用@RestController正文的控制器类。

而后定义应用@RequestMapping正文的处理程序办法。

您还能够应用@PathVariable正文的URI模板参数。此处显示的代码示例公开了REST端点/ users / {user}。 {user}的代码是用于自定义REST申请的门路变量。 Spring Boot提供了一个Jackson ObjectMapper的主动配置，用于JSON无效负载和POJO对象之间的主动编组。

Spring在构建REST资源时，通常应用@RestController和@RequestMapping来定义。而JavaEE定义的时候，通常应用JAX-RS实现@Path。当然，在Spring中也能够应用JAX-RS。

作为开发的另一种抉择，您能够应用JAX-RS。默认的Spring Boot JAX-RS实现是Jersey，它是Glassfish Jax-RS实现。您能够应用spring-boot-starter-jersey Spring Boot启动器。 Spring Boot提供Jersey servlet和Jackson数据绑定的主动配置。您能够应用规范的JAX-RS正文构建REST端点，例如@ javax.ws.rs.Path，@ javax.ws.rs.Produces和javax.ws.rs.GET。此代码示例演示如何应用JAX-RS在Spring中构建REST资源。

REST资源类须要在Jersey上下文中注册。这里显示了一个例子。

Spring Boot包含对嵌入式Tomcat，Jetty和Undertow服务器的反对。默认状况下，Spring Boot启动程序（特地是spring-boot-starter-web）应用Tomcat作为嵌入式容器。要应用备用服务器，请排除Tomcat依赖项并蕴含所需的依赖项。这里的代码片段显示了如何排除Tomcat并蕴含Undertow服务器所需的依赖关系。

Spring Framework为应用SQL数据库提供了宽泛的反对。您能够应用JdbcTemplate间接进行JDBC拜访。您还能够将JPA对象关系映射与Hibernate一起应用。 Spring Data为反对SQL，NoSQL，MapReduce框架和基于云的数据服务的数据拜访提供了基于Spring的编程模型。 Spring Boot提供以下启动器：spring-boot-starter-jdbc和spring-boot-starter-data-jpa。 Spring Boot的一个很好的性能是内存数据库的主动配置，非常适合测试。此外，Spring Boot还提供具备内部配置属性的数据源的主动配置。

Spring Framework还提供实体类扫描，以及Spring Data Repository类的主动注册。 Spring JPA存储库是封装数据拜访的接口。 JPA查问是从办法名称主动创立的。这里显示了一个例子。

Spring Boot配置能够内部化，以便雷同的利用程序代码能够在不同的环境中工作。您能够应用属性文件，YAML文件，环境变量和命令行参数来内部化配置。能够应用@Value正文将属性值间接注入bean，通过Spring的Environment形象拜访，或通过@ConfigurationProperties绑定到结构化对象。

Spring Boot应用一个有序的序列来指定属性，以便容许正当地笼罩值。程序如下：

@TestPropertySource

命令行参数

Java零碎属性

OS环境变量

打包JAR之外的特定于配置文件的应用程序属性

打包的JAR中的特定于配置文件的应用程序属性

默认属性

应用@Value（“$ {property}”）正文来注入配置属性可能很麻烦。 Spring Boot提供了另一种抉择。您能够定义强类型bean来治理和验证应用程序的配置。

上面的代码示例定义了以下属性：

foo.enabled，默认为false

foo.remote-address，具备能够从String强制转换的类型

foo.security.username，具备嵌套安全性

foo.security.roles，带有String汇合

您能够像应用任何其余bean一样注入此配置。

Spring Profiles提供了一种隔离应用程序配置局部的办法，并使每个局部仅在某些环境中可用 - 例如，dev，QA或production。

任何@Component或@Configuration都能够用@Profile标记，以限度何时加载。

特定于配置文件的属性文件名为application- {profile} .properties。

当配置文件处于活动状态时，您能够笼罩application.properties中的默认属性。

您能够通过以下任何形式指定流动配置文件：应用-Dspring.profiles.active = dev作为命令行上的零碎属性作为应用导出SPRING_PROFILES_ACTIVE = dev的环境变量在应用spring.profiles.active = dev的应用程序属性中在应用@ActiveProfiles（“test”）的测试用例中

Spring Cloud是一个用于开发云原生应用程序的框架。Spring Cloud提供了通用设计模式的实现，以反对云本机应用程序的开发。 Spring Cloud提供的解决方案：

集中配置管理
服务注册和发现
负载平衡
断路器
异步通信
分布式跟踪

Spring Cloud还提供第三方工具和库的集成和形象：

Netflix OSS Eureka服务注册表
HashiCorp服务注销
Netflix OSS Hystrix断路器和隔板
Netflix OSS功能区客户端负载均衡器
Apache Kafka和RabbitMQ音讯代理
Zipkin分布式追踪

Spring Cloud Kubernetes提供Spring Cloud与Kubernetes和OpenShift的集成。它由Red Hat Fabric8.io团队发动，当初由Spring Cloud Incubator托管。

性能包含以下内容：

带有ConfigMaps和secret的Spring Boot配置
当在ConfigMap中检测到更改时，PropertySource从新加载以触发应用程序从新加载
pod运行状况指示器，用于将特定于pod的运行状况数据增加到Spring Actuator运行状况端点
在Kubernetes上运行时，Kubernetes配置文件主动配置
Kubernetes的功能区发现
Archaius-a Netflix OSS配置管理库-ConfigMap属性源
透明度 - 当应用程序在Kubernetes / OpenShift之外运行时，Spring Cloud Kubernetes不会中断

在Red Hat Fuse Integration Services 2.x版中，Spring Boot是在OpenShift上开发Camel应用程序的首选框架。启动器模块是camel-spring-boot-starter。 CamelContext的主动配置在Spring应用程序上下文中注册。应用@Component正文的Camel路由会自动检测并注入CamelContext。

二：试验展示：构建购物车

在本试验中，您增加了为Coolstore应用程序的购物车微服务公开REST API的性能。实验室从上一个实验室的解决方案代码开始，包含您应用的其余文件。

为购物车微服务实现和公开REST API

查看并运行REST API的单元测试

利用架构

购物车微服务由一个Maven我的项目组成，该我的项目外部由许多服务对象组成：

PriceCalculationService蕴含用于计算购物车的运费和总价值的逻辑。

CatalogService负责调用目录服务以获取产品数据。

ShoppingCartService负责管理购物车。

CartEndpoint蕴含用于拜访购物车微服务的REST API。

在本试验中，您将增加REST API的实现以拜访CartEndpoint类中的购物车微服务。

启动Red Hat Developer Studio。抉择文件→导入。在“导入”对话框中，抉择“Maven”→“现有Maven我的项目”，而后单击“下一步”。单击“浏览”并导航到〜/ appmod_springboot_experienced / lab-02。这是您解压缩本试验的代码的目录。确保为我的项目选中了/pom.xml框，而后单击Finish。导入后，验证您是否看到该我的项目。

查看购物车服务项目的pom.xml文件，并留神以下事项：在dependencyManagement局部中，导入spring-boot-dependencies物料清单（BOM）POM。此POM蕴含特定Spring Boot版本反对的所有依赖项的策动列表。实际上，这意味着您不用手动跟踪在构建配置中增加的依赖项的版本，因为Spring Boot正在为您治理。降级Spring Boot自身时，依赖关系也会以统一的形式降级。在Red Hat OpenShift Application Runtimes环境中认证的Spring Boot版本是1.5.10.RELEASE。 spring-boot-maven插件用于构建可执行的JAR文件（fat JAR）。插件的从新打包指标创立了一个可主动执行的JAR（或WAR）文件。

应用Spring Boot开发一个购物车微服务应用Spring Boot，能够应用不同的技术来构建REST API。您能够应用Spring MVC框架或实现JAX-RS标准的框架。对于购物车服务，须要以下REST端点： GET / cart / {cartId}按ID获取购物车。 POST / cart / {cartId} / {itemId} / {quantity}将商品增加到购物车。 DELETE / cart / {cartId} / {itemId} / {quantity}从购物车中删除商品。 POST / cart / checkout / {cartId}查看购物车。

咱们查看源码，进行剖析：

package com.redhat.coolstore.cart.rest;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import com.redhat.coolstore.cart.service.ShoppingCartService;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

import com.redhat.coolstore.cart.model.ShoppingCart;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.DeleteMapping;

@RestController

@RequestMapping("/cart")

//@RequestMapping批注标识资源类或类办法为其申请的URI门路。购物车服务的URI门路是/ cart。@RestController正文将此类标识为REST资源//

public class CartEndpoint {

private static final Logger LOG = LoggerFactory.getLogger(CartEndpoint.class);

//应用SLF4J API配置一个logger//

@Autowired

private ShoppingCartService shoppingCartService;

//应用Spring @Autowired正文注入ShoppingCartService//

@GetMapping("/{cartId}")

public ShoppingCart getCart(@PathVariable String cartId) {

return shoppingCartService.getShoppingCart(cartId);

}

//@GetMapping示意带正文的办法响应HTTP GET申请。URI局部附加到类级别定义的根本门路。 {cartId}示意模板参数名称。@PathVariable将URI模板参数的值绑定到办法变量。此代码将调用委托给ShoppingCartService.getShoppingCart办法。//

@PostMapping("/{cartId}/{itemId}/{quantity}")

public ShoppingCart add(@PathVariable String cartId,

@PathVariable String itemId,

@PathVariable int quantity) {

return shoppingCartService.addToCart(cartId, itemId, quantity);

}

//此办法实现REST POST / cart / {cartId} / {itemId} / {quantity}端点。//

@DeleteMapping("/{cartId}/{itemId}/{quantity}")

public ShoppingCart delete(@PathVariable String cartId,

@PathVariable String itemId,

@PathVariable int quantity) {

return shoppingCartService.removeFromCart(cartId, itemId, quantity);

}

//此办法实现DELETE / cart / {cartId} / {itemId} / {quantity}端点。//

@PostMapping("/checkout/{cartId}")

public ShoppingCart checkout(@PathVariable String cartId) {

ShoppingCart cart = shoppingCartService.checkoutShoppingCart(cartId);

LOG.info("ShoppingCart " + cart + " checked out");

return cart;

}

//此办法实现REST POST / cart / checkout / {cartId}端点。目前，只需记录购物车已签出的事实就足够了。//

查看并运行端到端集成测试此时，您已筹备好所有局部。在本节中，您将查看并运行购物车服务的端到端测试（或集成测试）。 Spring Boot容许集成测试，而无需理论部署应用程序或连贯到其余基础架构。 Spring Boot应用程序作为测试自身的一部分进行自举。所须要的只是依赖于spring-boot-starter-test启动器。您能够应用不同的技术在集成测试中测试REST端点。 REST Assured是一种晦涩而优雅的Java DSL，用于简化基于REST的服务的测试，可用于验证和验证这些服务的响应。 Rest Assured使得验证JSON或XML无效负载变得特地容易。要模仿近程目录服务，您能够应用WireMock框架，就像在CatalogService服务的测试中一样。 Spring Boot应用程序 - 更具体地说，是CatalogService实现 - 冀望将catalog.service.url零碎属性设置为近程目录服务的URL。将此属性注入测试的一种办法是利用Spring配置文件和Spring Boot对特定于配置文件的属性的反对。在我的项目的src / test / resources文件夹中，查看名为application-test.properties的文件：

无需为此属性设置值，因为理论的URL（特地是WireMock服务器绑定的端口）在执行测试自身之前是未知的。您将理论URL注入测试代码。 Spring Boot从类门路根目录中的application.properties和application- {profile} .properties文件加载属性，并将它们增加到Spring环境中。在这种状况下，仅在测试配置文件处于活动状态时才加载application-t

est.properties。

抉择我的项目的src / test / java文件夹。查看com.redhat.coolstore.cart.rest包中的CartEndpointTest类。

此批注激活测试配置文件，因而application-test.properties文件将加载到Spring上下文中。

咱们查看测试的源码：

package com.redhat.coolstore.cart.rest;

import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;

import static com.github.tomakehurst.wiremock.client.WireMock.get;

import static com.github.tomakehurst.wiremock.client.WireMock.stubFor;

import static com.github.tomakehurst.wiremock.client.WireMock.urlEqualTo;

import static com.github.tomakehurst.wiremock.core.WireMockConfiguration.wireMockConfig;

import static io.restassured.RestAssured.given;

import static org.hamcrest.Matchers.equalTo;

import static org.hamcrest.Matchers.hasItems;

import static org.hamcrest.Matchers.hasSize;

import java.io.InputStream;

import java.nio.charset.Charset;

import org.apache.commons.io.IOUtils;

import org.junit.Before;

import org.junit.Rule;

import org.junit.Test;

import org.junit.runner.RunWith;

//SpringRunner类提供了JUnit测试框架和Spring框架之间的集成。当应用SpringRunner，Spring应用程序上下文时 - 在Spring Boot的状况下，这是Spring Boot应用程序自身 - 在测试和启用Spring组件的依赖注入之前的bootstraps。//

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.context.embedded.LocalServerPort;

import org.springframework.boot.test.context.SpringBootTest;

import org.springframework.test.annotation.DirtiesContext;

import org.springframework.test.context.ActiveProfiles;

import org.springframework.test.context.junit4.SpringRunner;

import org.springframework.test.util.ReflectionTestUtils;

import com.github.tomakehurst.wiremock.junit.WireMockRule;

import com.redhat.coolstore.cart.service.CatalogService;

import io.restassured.RestAssured;

import io.restassured.http.ContentType;

@ActiveProfiles("test")

@RunWith(SpringRunner.class)

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)

//@SpringBootTest正文在惯例Spring测试框架上提供了一些特定于Spring Boot的加强性能。特地是，SpringBootTest.WebEnvironment.RANDOM_PORT环境加载了一个嵌入式WebApplicationContext并提供了一个真正的servlet环境。

嵌入式servlet容器（在本例中为Tomcat）在随机端口上启动和监听。

public class CartEndpointTest {

@LocalServerPort

private int port;

@Rule

public WireMockRule wireMockRule = new WireMockRule(wireMockConfig().dynamicPort());

@Autowired

private CatalogService catalogService;

@Before

public void beforeTest() throws Exception {

RestAssured.baseURI = String.format("http://localhost:%d/cart", port);

ReflectionTestUtils.setField(catalogService, null, "catalogServiceUrl", "http://localhost:" + wireMockRule.port(), null);

initWireMockServer();

}

@Test

public void retrieveCartById() throws Exception {

given().get("/{cartId}", "123456")

.then()

.assertThat()

.statusCode(200)

.contentType(ContentType.JSON)

.body("id", equalTo("123456"))

.body("cartItemTotal", equalTo(0.0f))

.body("shoppingCartItemList", hasSize(0));

}

@Test

@DirtiesContext

//为了可能测试调用近程目录服务的REST端点，能够应用WireMock模仿目录服务。因为WireMock服务器绑定到随机端口（对于每个测试方法可能都是不同的端口），因而必须应用ReflectionTestUtils将理论的WireMock URL注入CatalogService实例。

应用WireMock时，会为每个测试方法实例化WireMock服务器的新实例，并绑定到不同的端口。因而，还必须为应用WireMock服务器的测试方法从新创立Spring上下文。这能够通过应用Spring @DirtiesContext正文来正文这些测试方法来实现。

public void addItemToCart() throws Exception {

given().post("/{cartId}/{itemId}/{quantity}", "234567", "111111", new Integer(1))

.then()

.assertThat()

.statusCode(200)

.contentType(ContentType.JSON)

.body("id", equalTo("234567"))

.body("cartItemTotal", equalTo(new Float(100.0)))

.body("shoppingCartItemList", hasSize(1))

.body("shoppingCartItemList.product.itemId", hasItems("111111"))

.body("shoppingCartItemList.price", hasItems(new Float(100.0)))

.body("shoppingCartItemList.quantity", hasItems(new Integer(1)));

}

@Test

@DirtiesContext

public void addExistingItemToCart() throws Exception {

given().post("/{cartId}/{itemId}/{quantity}", "345678", "111111", new Integer(1));

given().post("/{cartId}/{itemId}/{quantity}", "345678", "111111", new Integer(1))

.then()

.assertThat()

.statusCode(200)

.contentType(ContentType.JSON)

.body("id", equalTo("345678"))

.body("cartItemTotal", equalTo(new Float(200.0)))

.body("shoppingCartItemList", hasSize(1))

.body("shoppingCartItemList.product.itemId", hasItems("111111"))

.body("shoppingCartItemList.price", hasItems(new Float(100.0)))

.body("shoppingCartItemList.quantity", hasItems(new Integer(2)));

}

@Test

@DirtiesContext

public void addItemToCartWhenCatalogServiceThrowsError() throws Exception {

given().post("/{cartId}/{itemId}/{quantity}", "234567", "error", new Integer(1))

.then()

.assertThat()

.statusCode(500);

}

@Test

@DirtiesContext

public void removeAllInstancesOfItemFromCart() throws Exception {

given().post("/{cartId}/{itemId}/{quantity}", "456789", "111111", new Integer(2));

given().delete("/{cartId}/{itemId}/{quantity}", "456789", "111111", new Integer(2))

.then()

.assertThat()

.statusCode(200)

.contentType(ContentType.JSON)

.body("id", equalTo("456789"))

.body("cartItemTotal", equalTo(new Float(0.0)))

.body("shoppingCartItemList", hasSize(0));

}

@Test

@DirtiesContext

public void removeSomeInstancesOfItemFromCart() throws Exception {

given().post("/{cartId}/{itemId}/{quantity}", "567890", "111111", new Integer(3));

given().delete("/{cartId}/{itemId}/{quantity}", "567890", "111111", new Integer(1))

.then()

.assertThat()

.statusCode(200)

.contentType(ContentType.JSON)

.body("id", equalTo("567890"))

.body("cartItemTotal", equalTo(new Float(200.0)))

.body("shoppingCartItemList", hasSize(1))

.body("shoppingCartItemList.quantity", hasItems(new Integer(2)));

}

@Test

@DirtiesContext

public void checkoutCart() throws Exception {

given().post("/{cartId}/{itemId}/{quantity}", "678901", "111111", new Integer(3));

given().post("/checkout/{cartId}", "678901")

.then()

.assertThat()

.statusCode(200)

.contentType(ContentType.JSON)

.body("id", equalTo("678901"))

.body("cartItemTotal", equalTo(new Float(0.0)))

.body("shoppingCartItemList", hasSize(0));

}

private void initWireMockServer() throws Exception {

InputStream isresp = Thread.currentThread().getContextClassLoader().getResourceAsStream("catalog-response.json");

stubFor(get(urlEqualTo("/product/111111")).willReturn(

aResponse().withStatus(200).withHeader("Content-type", "application/json").withBody(IOUtils.toString(isresp, Charset.defaultCharset()))));

stubFor(get(urlEqualTo("/product/error")).willReturn(

aResponse().withStatus(500)));

}

应用Red Hat Developer Studio中的JUnit测试运行器运行测试。

或者，在命令行中应用Maven：

开始测试：

测试过程中的打印：

14项测试胜利：

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